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Vermicrete - Forno Bravo Forum: The Wood-Fired Oven Community


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Dome Installation Video - Casa / Premio / Modena


For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

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If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

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  • Vermicrete

    Couple of questions with regard to vermicrete over the dome, not under the floor.

    Should I cure before the thickest insulation so the moisture can escape? I am adding a few inches of loose bulk InsWool HP, which can be intentionally wetted during application to ease distribution and placement (I'm hoping to hold it down with some variant on chickenwire or something with a smaller mesh). Should I fire the oven up before going over that with vermicrete to drive the moisture out?

    What ratio vermiculite/portland would you recommend? I've read the dome layer can be considerably higher ratio than the floor layer (I didn't use it under my floor anyway) since it doesn't have to bear any load. Past posts have suggested as wide a range as 5:1 to 10:1. I'm not sure where on that spectrum to land.

    Is there any utility in adding lime? Would that make it more workable/moldable? What is it like to work with? How large batch can I mix and work at once?

    What water consistency am I shooting for? Remember, I didn't use it under my floor (just boards), so I have no experience with mixing vermicrete at all yet. As my main thread will illustrate, I didn't do a very good job gauging the water in standard concrete (although I think my mortar has been pretty good).


    Website: http://keithwiley.com
    WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
    Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html

  • #2
    Re: Vermicrete

    I suggest:

    - Place vermicrete before curing.
    - Use a 12:1 vermiculite cement ratio.
    - Skip the chicken wire.
    - No lime


    • #3
      Re: Vermicrete

      I've not mixed any vermicrete yet either, but if your mortar is good you're doing better than I. Mine seems to be a bit dry as I'm mixing (in a wheelbarrow with a hoe), but then 30 seconds later it goes to soup and I end up having to add more dry stuff. Maybe by the time I've finished this little project I'll have mastered the mix.